Question

What is standard unit? why is it necessary.
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Answer 1

We need standard unit for measurement to make our judgement more reliable and accurate. For proper dealing, measurement should be same for everybody. Thus there should be uniformity in measurement. For the sake of uniformity we need a common set of units of measurement, which are called standard units.

Answer 2

Standard Units are commonly used units of measurement, which help us measure length, height, weight, temperature, mass, and more. These units are standardised, which means that everyone gets the same understanding of the size, weight and other properties of objects and things.

Step-by-step explanation:

Why is it necessary? We need standard judgement unit for measurement to make our judgment more reliable and accurate. Thus there should be uniformity in measurement. For the sake of uniformity we need a common set of units of measurement, which are called standard units. Nowadays, Si units in science and technology almost accepted universally.